碲锌镉晶体Zn组分的光致发光实用化研究

利用激光显微光致发光光谱仪测试了碲锌镉晶片的室温显微光致发光谱,对测得的光致发光谱进行拟合得到碲锌镉材料带隙的Eg值,根据实验总结出的Eg与Zn组分的室温计算公式,结合自主开发的Zn组分计算程序得到碲锌镉晶片上的Zn组分。所得的Zn组分结果用X射线双晶衍射进行验证,结果显示,室温下显微光致发光测得的Zn组分是相对准确可信的,可作为大量常规工艺测定Zn组分的有效工具,并且获得的Zn组分可成为外延碲镉汞薄膜时筛选匹配衬底的重要依据,同时还为研究和优化碲锌镉晶体生长工艺提供重要帮助。

Study on the Zn composition test in cadmium zinc telluride crystal by photoluminescence

Micro-photoluminescence spectra of cadmium zinc telluride crystal at room temperature was tested by laser excited micro-photoluminescence spectroscopy.The Eg value of cadmium zinc telluride material was calculated by fitting the micro-photoluminescence spectra from the material band gap.According to the relationship between Eg and Zn composition derived from experiment data,the Zn composition was obtained with a self-developed program.The results was validated by X-ray double crystal diffraction.Experiment results prove that the Zn composition results by micro-photoluminescence is accurate and authentic.Therefore the room temperature micro-photoluminescence is an important test tool to measure the Zn composition in large scale fabrication.The Zn composition is an important basis for selecting the matching substrates in epitaxial HgCdTe film.That is helpful for studying and optimizing the growth of cadmium zinc telluride crystal.